Did they use a body double in orphan?

Yes, a body double was used in "Orphan." The film features a young actress, Isabelle Fuhrman, who portrays the character Esther, but for certain scenes, particularly those requiring adult-like physicality, a body double was employed to maintain the illusion of Esther's character being older than she appears. This technique helped enhance the film's eerie atmosphere while ensuring the safety and comfort of the child actress during filming.